The logical 0 (zero), also known as "space", is encodded with positive voltage from +5V to +25V relative to ground. The logical 1 (one), also known as "mark", on signal pins is encoded with negative voltage from -25V to -5V relative to ground. In RS-232 terms, a computer is a Data Terminal Equipment (DTE), and a target or a pripheral device is a Data Circuit-terminating Equipment (DCE).ĭE-9 Male connector at the DTE or computer Pin Despite being slow, RS-232 serial communiation may still be used in modern computers, peripheral devices and embedded systems, because it offers a practical, easy-to-program alternative to faster interfaces. Most modern computers, especially those manufactured after 2005, do not have integrated RS-232 communications, but it is possible to equip such a computer with a USB-to-RS-232 converter, for example. This article describes the pin assignments of the most popular form of DE-9, also known as DE9, DB-9 or DB9 connector for serial communication known as RS-232, or RS-232C, or RS232, found on personal computers. The pinout of the DE-9 D-subminiature connector, also known as DE9, DB-9 or DB9 for PC serial RS-232 (RS232) COM port is detailed on this page.
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